This isn't that serious, just something funny that just happened due to a bug.

Was grinding my waves as usual and all of a sudden I saw a glowing arrow on the ground. I knew straight away that it was one of the anti-mech shots that glitched out and froze, but it was perfectly in the center of the tile so it looked really cool, as if it was actually meant to be there. Got a bit mesmerized, walked over to check it out, dead.